CN1388976A - Method of making substantially closed magnetic core, magnetic core and magnetic coil - Google Patents
Method of making substantially closed magnetic core, magnetic core and magnetic coilDownload PDFInfo
- Publication number
- CN1388976A CN1388976ACN01802503ACN01802503ACN1388976ACN 1388976 ACN1388976 ACN 1388976ACN 01802503 ACN01802503 ACN 01802503ACN 01802503 ACN01802503 ACN 01802503ACN 1388976 ACN1388976 ACN 1388976A
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- magnetic core
- slit
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- synthetic resin
- gap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49069—Data storage inductor or core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Insulating Of Coils (AREA)
Abstract
Translated fromChinese
Description
Technical field
The present invention relates to the method for toroidal core of geometry base closed that a kind of manufacturing has first slit of basic filling, described magnetic core has the inner surface that has formed inner peripheral surface, has formed outer surface and two substantially parallel sides of outer circumference surface.Described magnetic core is applicable to magnetic coil.
The invention still further relates to a kind of toroidal core that is provided with first slit of base closed, in described first slit basically filling interval insulant, described magnetic core has the inner surface that has formed inner peripheral surface, formed the outer surface of outer circumference surface, with two substantially parallel side surfaces, described magnetic core is applicable to magnetic coil.
The invention still further relates to the magnetic coil that comprises magnetic core and a lot of numbers of turn.
Background technology
The exercise question that this magnetic core and this method can be published on the www.cmi-ferrite.com from the Brian Wiese and the George Schaller of ceramic magnetics research institute (Ceramic MagneticsInc.) is known in the article of " a kind of new magnetic element-microgap ring bodies (The Micro-GappedToroid, A New Magnetic Component) ".Described magnetic core, the magnetic core that is referred to as below to crack can obtain on market to be different from the sealing magnetic core that does not crack.In known method, the magnetic core of sealing is cut into two halves, bonds to interval insulant and forms two slits together.Therefore, the known magnetic core that cracks has two slits, and two slits have formed 180 °.This magnetic core has 3.4 to the interior external diameter of 12.5mm scope.According to following analysis to the known magnetic core that cracks, interval insulant is the paillon foil that has end face and bottom surface.The magnetic core of two halves is bonded on the paillon foil, and this expression binding agent remains on two surfaces.After the magnetic core of two halves is assemblied on the paillon foil, excise the redundance of paillon foil.Slit foil material and binding agent filling then.
The shortcoming of known method is the magnetic core of two halves to be assembled into the magnetic core that cracks.The cost of assembly work is very high.
Summary of the invention
First purpose of the present invention provides a kind of the sort of method of introducing in opening paragraph.This method need not be carried out the assembling of two halves magnetic core.
Second purpose of the present invention provides a kind of the sort of magnetic core of introducing in opening paragraph, this magnetic core is made in cost-efficient mode.
The realization of first purpose is by comprising the method for following consecutive steps, first slit promptly is set in magnetic core, being cured with curable synthetic resin filling first slit with to described curable synthetic resin.
In the method for the invention, the interval insulant in first slit is not paillon foil but synthetic resin, and synthetic resin is sticking polymeric liquid.Therefore, can apply at an easy rate.Next this liquid will be cured, and can carry out by heating or with UV-irradiation, and the example of curable synthetic resin has polyepoxide, polyacrylate, and other.After being cured, synthetic resin and magnetic core have bonding well, and this concave surface from synthetic resin can be found out significantly.
In the method for the invention, do not need to carry out the assembling of two two halves magnetic cores.Curable synthetic resin in first slit can be provided with second slit after curing.Filling also can be come with curable synthetic resin in described second slit.Other slit can also be set.
The slit is set adopts the whole bag of tricks of the prior art.Cut such as laser cutting with diamond saw.Adding synthetic resin is preferably undertaken by the distributor that has navigation system.This distributor can have been bought from the market, belongs to the classification of setting element device.The non-compact core that exclusively is highly suitable for of the method, promptly the external diameter of magnetic core less than 25mm and gap width less than 1.5mm.Magnetic core preferably includes Ferrite Material.
In the embodiment of method of the present invention, be provided with before first slit, magnetic core is placed on the supporting body with surface, and magnetic core is positioned at the outside on supporting body surface.The embodiment of this method is highly suitable for first slit is set in the magnetic core.A plurality of magnetic cores with the coaxial manner setting can be provided with in a collection of and filling first slit, are used to cut or cut off and carry out assigned unit and can coaxially move.The magnetic core of the coaxial setting of each parallel also can use the device that has a plurality of cuttings and dispensing tool to process synchronously.So just greatly increased the manufacturing working ability.This embodiment also has the advantage that a large amount of magnetic cores can be placed in the surf zone relatively little on the same supporting body.
In another embodiment of method of the present invention, before first slit is set, magnetic core is connected on the supporting body with surface, first first type surface of magnetic core is positioned on the surface of supporting body.Magnetic core remains on the position on supporting body surface with at least a connected mode in the process in setting and filling first slit.In fact a large amount of magnetic cores can be processed synchronously.These magnetic cores can advantageously be placed on the supporting body, by connected mode magnetic core are remained on position on the supporting body.If be provided with first slit, the slit in the magnetic core can remain on the position on the supporting body.Therefore can simplify the filling in first slit.
Connected mode can be a chemical mode, before magnetic core is connected to supporting body, has the feature of the binding agent drop on the plane of supporting body surface or magnetic core.Connected mode can also be a mechanical mode, for example, has on the supporting body surface or the groove on the lip-deep one or more protuberances of described supporting body and the feature of recess.Connected mode even can be dynamo-electric mode is for example by being arranged on the supporting body or the electromagnetic field of the generation of magnetic sources such as magnet down.
In the another embodiment of method of the present invention, second slit almost synchronously is provided with first slit, and first and second slits have surrounded about 180 ° of angles together.If a plurality of magnetic cores are connected to supporting body and are arranged into a row.First slit not only is set is easy to, second slit is set on each magnetic core also is easy to, for example by cutting or cut along a line.Especially, if first and second slits are provided with synchronously, connected mode that very crucial is is wanted can be with magnetic core, thereby the slit of the two halves of magnetic core and magnetic core remains on the lip-deep position of supporting body.The magnetic core that manufacturing has first and second slits has superiority, compares with the magnetic core that has only one first slit, can reduce edge flux significantly, thereby reduce electric loss significantly.Certainly after being provided with first and second slits, other slit can also be set.
The advantage of method of the present invention is that synthetic resin can mix with charges before adding the slit to.Can make the character of the interval insulant in the suitable slit of described charges, as permeability or viscosity.As a comparison, owing to there is paillon foil, known magnetic core can not be spaced apart the material filling.Charges are magnetic material preferably.The magnetic property that can effectively adapt in this case, magnetic core.A plurality of magnetic cores can be made, afterwards, magnetic property can be accurately adjusted by the magnetic material kind with as the variation of the magnetic material concentration of charges with standard size and standardized gap width.
Purpose that the magnetic core of making in cost-efficient mode is provided is by realizing that as interval insulant synthetic resin is evenly distributed in first slit and the surface with indent substantially with synthetic resin.The result of method of the present invention is that magnetic core of the present invention can cost-efficient mode be made.The advantage of magnetic core of the present invention is that its mechanical stability is fine, in addition more than one slit can be set, the external diameter of magnetic core approximately 4mm or thickness in the millimeter level.Magnetic core preferably contains Ferrite Material.The magnetic loss of FERRITE CORE that has the slit is low, can have less external diameter, and the direct current saturation effect is had good opposing.Therefore the FERRITE CORE that has the slit is highly suitable for the application scenario of switching frequency in the MHz scope.Magnetic core is annular preferably, but also can be rectangle, and in this case, interior and outer surface is constituted the surface and formed by a plurality of.Its external diameter can arrive in the scope of20mm 2, is preferably in 3.4 in the scope of 12.5mm.
In the embodiment of magnetic core of the present invention, synthetic resin mixes with charges.Described charges can be the solid materials of any kind of, as the particle of aluminium, silicon, glass.The advantage that synthetic resin mixes with charges is that synthetic resin shrinks when solidifying, shrinkage is limited in and is not more than 0.5%, is generally 0.1 to 0.3%.The average diameter of charges particle is preferably in 5 to 50 μ m.With respect to curable synthetic resin, the preferred concentration of charges is 0.1 to 60 volume %.
In another embodiment of magnetic core of the present invention, charges are magnetic materials.The example of magnetic material has ferrite, as MnZn, and NiZn, the particle of MgZn and iron content.The synthetic resin that mixes with the magnetic charges has bigger permeability than the synthetic resin of no charges.Therefore the synthetic resin that mixes with the magnetic charges have a lot of advantages, and for example, any ring-shaped magnetic core that has the slit has the edge flux that can cause electricity to decrease.Higher permeability can reduce the edge flux around the slit.Another advantage of magnetic core of the present invention be gap width can than have identical in similar magnetic core big of external diameter and same magnetic properties.For example, if the ratio of the synthetic resin of filling and the permeability of the synthetic resin of filling not about 2.7, gap width is increased to 200 μ m from 75 μ m.Gap width is that the slit of 200 μ m is the easier making of 75 μ m than gap width.In addition, width is that the tolerance in slit of 200 μ m is bigger, and therefore higher output is provided.In addition, width be 200 μ m the slit can by two separately gap width be that the slit of 100 μ m replaces.As a comparison, gap width is the approaching technological limit that cuts and cut in slit of 35 μ m.
Have filling contain the synthetic resin of the charges that are magnetic the other advantage of magnetic core in first slit be that the performance of magnetic core can accurately be adjusted by the concentration of magnetic charges and the variation of kind.Simultaneously, the magnetic core with adjusted magnetic property can cost-efficient mode be produced, magnetic core can standardized size and gap width produce.For example, adopt the magnetic charges chance that width is the slit of 200 μ m to be set, and to have with the width of not filling be the identical permeability in slit of 10 μ m for magnetic core provides.
Magnetic core of the present invention is highly suitable for the sort of magnetic coil in the opening paragraph introduction.Described coil is fit to be applied to the electrical management loop very much, and power inverter has the signal inductor of direct current component, occasions such as Linear Induction Motor and high frequency temperature stabilization device.
Although the present invention introduces by the mode of some preferred embodiments.The those skilled in the art will be appreciated that in the spirit of appended claims and scope and can improve the present invention.
Description of drawings
These and other characteristic aspect of method of the present invention and magnetic core will further be illustrated by accompanying drawing, wherein:
Fig. 1 is the schematic plan view that has the coil of single slit magnetic core according to of the present invention;
Fig. 2 is the schematic cross sectional views in the magnetic core slit of filling, is the details that square I-I represents the amplification of part among Fig. 1;
Fig. 3 analyses and observe similarly schematic cross sectional views of part according to the magnetic core that has the slit of prior art and Fig. 2;
Fig. 4 is the perspective schematic view that has the magnetic core in two slits according to of the present invention;
Fig. 5 is a schematic sectional perspective view of placing the supporting body of a plurality of magnetic cores;
Fig. 6 places the schematic sectional plain-view drawing of another supporting body of a plurality of magnetic cores;
Fig. 7 is described supporting body is cut part open along Fig. 6 center line V-V a schematic cross sectional views.
Embodiment
Fig. 5 has shown the supportingbody 20 of having placed a plurality of loop coils 1.Supportingbody 20 has surface 21.The connected mode oftoroidal core 1 leans against on thesurface 21 of supportingbody 20outer surface 6 of magnetic core 1.First slit 2 forms by cutting or cut on described magnetic core.Filling is come with curable synthetic resin basically by distributor in described first slit 2.Behind curable curable synthetic resin, second slit can be set on magnetic core 1.This can be advantageously by with the orthogonal plane of supportingbody 20 on relative supportingbody 20 rotarymagnetic cores 1 realize.
Fig. 6 has schematically shown a plurality oftoroidal cores 11, andmagnetic core 11 is connected to aside 7 on thesurface 21 of supportingbody 20, and this finished be arranged on themagnetic core 11 inslit 2,12 before.Fig. 7 has shown that schematicallymagnetic core 11 remains on position on thesurface 21 by connectedmode 22,23.Connectedmode 22 is protuberances, mechanicallymagnetic core 11 is remained on its position.Connectedmode 23 is drops of binding agent,magnetic core 11 is remained on its position with chemical mode by binding agent.When magnetic core remains on its position, firstslit 2 and preferably also have second slit 12 can be arranged on themagnetic core 11, and come filling with curable synthetic resin.The selection of connectedmode protuberance 22, third and fourth slit also can be set, rotates 90 at supporting body relative to cutting of not showing and bringing device and carry out filling after spending.Described rotation will be carried out on the plane on thesurface 21 of supporting body 20.Example 1
Thetoroidal core 1 of MnZn-ferrite base, its OD are 4.5mm, and ID is 2.3mm, are 1.4mm highly, and havingwidth 8 is firstslit 2 of 50 μ m.The permeability ofmagnetic core 1 is 2000, so can have 45 * 10 whenmagnetic core 1 is used for magnetic coil 10-9H/n2Induction coefficient.In described expression formula, n is the quantity of the number of turn 9.First slit 2 adopts diamond saw to saw out.First slit, 2 usefulness are without any the synthetic resin filling that has viscosity of the uv-curable of inorganic filling material.The viscosity of synthetic resin is 200mPa.s.Initial solidification be by 2 second intensity be 2000mW/cm2Ultraviolet point-source of light irradiation realize.The optimal heat performance of synthetic resin obtains in the back cure stage.Magnetic core 1 is encased fully by organic material, so that reach the insulating requirements of toroidal core 1.Example 2
Before carrying out fillingfirst slit 2, the synthetic resin that has viscosity of uv-curable mixes with charges.Charges mainly are made of the MnZn based ferrite particle that is of a size of 10 to 30 μ m.Synthetic resin is to mix with charges under the situation of 65 weight % in charges concentration.There is the synthetic resin of charges to have the viscosity of 1500mPa.s.There is the synthetic resin of charges to have and is approximately 10 permeability.
The OD that thetoroidal core 11 of MnZn-ferrite base has is 9.4mm, and ID is 5.1mm, highly is 2.6mm.Magnetic core hasfirst slit 2 and second slit 12.Thewidth 8 in each slit is 200 μ m.The permeability ofmagnetic core 11 is 2000, when being applied tomagnetic coil 10, can produce 25 * 10-9H/n2Induction coefficient.N is the number ofturn 9 in described expression formula.The angle that first slit 2 and second slit 12 have surrounded about 180 ° of degree together.Theplane 6 that makesmagnetic core 11 and be earliermagnetic core 11 is clipped on thesurface 21 of supportingbody 20, saws out the slit by diamond saw then, applies the synthetic resin of uv-curable and is cured to firstslit 2 and second slit 12.With concentration be the charges Al of 40 weight %2O3After the mixing, synthetic resin has the viscosity of 600mPa.s.In this way, kept original gap size.Initial solidification be by 2 second intensity be 2000mW/cm2The ultraviolet light point-source of light shine and finish.The hot property of binding agent the best realizes in the back cure stage.Magnetic core 1 is surrounded fully by organic material, so that reach the insulating requirements oftoroidal core 1.
Claims (10)
Translated fromChineseApplications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00202940.3 | 2000-08-24 | ||
| EP00202940 | 2000-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1388976Atrue CN1388976A (en) | 2003-01-01 |
Family
ID=8171941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01802503APendingCN1388976A (en) | 2000-08-24 | 2001-08-14 | Method of making substantially closed magnetic core, magnetic core and magnetic coil |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20020024413A1 (en) |
| EP (1) | EP1228517A1 (en) |
| JP (1) | JP2004507099A (en) |
| KR (1) | KR20020091049A (en) |
| CN (1) | CN1388976A (en) |
| TW (1) | TW526503B (en) |
| WO (1) | WO2002017336A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102282635A (en)* | 2009-01-20 | 2011-12-14 | Abb研究有限公司 | Gapped magnet core |
| CN105529128A (en)* | 2016-02-03 | 2016-04-27 | 深圳顺络电子股份有限公司 | A kind of inductor and its manufacturing method |
| CN110945606A (en)* | 2017-08-15 | 2020-03-31 | 罗伯特·博世有限公司 | Magnetic core and method for producing a magnetic core |
| CN113015328A (en)* | 2019-12-20 | 2021-06-22 | 奥特斯奥地利科技与系统技术有限公司 | Component carrier with embedded magnetic inlay and integrated coil structure |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4802639B2 (en)* | 2005-09-30 | 2011-10-26 | 株式会社島津製作所 | Electromagnetic balance electronic balance |
| JP2007242750A (en)* | 2006-03-07 | 2007-09-20 | Sht Corp Ltd | Coil unit and manufacturing method therefor |
| US20160126829A1 (en)* | 2014-11-05 | 2016-05-05 | Chicony Power Technology Co., Ltd. | Inductor and power factor corrector using the same |
| JP6830340B2 (en)* | 2016-11-08 | 2021-02-17 | 株式会社村田製作所 | Coil parts |
| DE102017214219A1 (en)* | 2017-08-15 | 2019-02-21 | Robert Bosch Gmbh | Slotted magnetic core and method of making a slotted magnetic core |
| US10840004B2 (en)* | 2018-08-23 | 2020-11-17 | Hamilton Sundstrand Corporation | Reducing reluctance in magnetic devices |
| WO2020070309A1 (en)* | 2018-10-05 | 2020-04-09 | Abb Schweiz Ag | Magnetic core arrangement, inductive device and installation device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2223800A1 (en)* | 1973-03-30 | 1974-10-25 | Telecommunications Sa | Magnetic circuits with spaced air gaps - are used in translators in telephone call circuits reducing crosstalk and leakage |
| JPS5934609A (en)* | 1982-08-20 | 1984-02-25 | Nippon Kinzoku Kk | Core for small sized reactor |
| WO1992005568A1 (en)* | 1990-09-21 | 1992-04-02 | Coilcraft, Inc. | Inductive device and method of manufacture |
| WO2001052277A1 (en)* | 2000-01-12 | 2001-07-19 | Koninklijke Philips Electronics N.V. | Method of manufacturing a substantially closed core, core, and magnetic coil |
- 2001
- 2001-08-14CNCN01802503Apatent/CN1388976A/enactivePending
- 2001-08-14WOPCT/EP2001/009392patent/WO2002017336A1/ennot_activeApplication Discontinuation
- 2001-08-14JPJP2002521314Apatent/JP2004507099A/enactivePending
- 2001-08-14EPEP01967271Apatent/EP1228517A1/ennot_activeWithdrawn
- 2001-08-14KRKR1020027005050Apatent/KR20020091049A/ennot_activeWithdrawn
- 2001-08-23USUS09/935,895patent/US20020024413A1/ennot_activeAbandoned
- 2001-08-24TWTW090120899Apatent/TW526503B/ennot_activeIP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102282635A (en)* | 2009-01-20 | 2011-12-14 | Abb研究有限公司 | Gapped magnet core |
| CN105529128A (en)* | 2016-02-03 | 2016-04-27 | 深圳顺络电子股份有限公司 | A kind of inductor and its manufacturing method |
| CN105529128B (en)* | 2016-02-03 | 2018-06-29 | 深圳顺络电子股份有限公司 | Inductor and manufacturing method thereof |
| CN110945606A (en)* | 2017-08-15 | 2020-03-31 | 罗伯特·博世有限公司 | Magnetic core and method for producing a magnetic core |
| CN113015328A (en)* | 2019-12-20 | 2021-06-22 | 奥特斯奥地利科技与系统技术有限公司 | Component carrier with embedded magnetic inlay and integrated coil structure |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1228517A1 (en) | 2002-08-07 |
| WO2002017336A1 (en) | 2002-02-28 |
| KR20020091049A (en) | 2002-12-05 |
| JP2004507099A (en) | 2004-03-04 |
| US20020024413A1 (en) | 2002-02-28 |
| TW526503B (en) | 2003-04-01 |
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